import { type Accessor, createContext, useContext } from "solid-js";
import type { TransitionStatus } from "../../internals/use-transition-status/use-transition-status";
import type { ToastObject } from "../use-toast-manager";

/**
 * State exposed by `<Toast.Root>` via `data-*` projection. `transitionStatus`
 * maps to `data-starting-style` / `data-ending-style` exactly like the
 * collapsible port.
 */
export interface ToastRootState {
	transitionStatus: TransitionStatus;
	/** Whether any toast in the viewport is being hovered or focused. */
	expanded: boolean;
	/** Whether the toast was pushed out by the provider's `limit`. */
	limited: boolean;
	/** The toast's `type` slot, forwarded from the toast object. */
	type: string | undefined;
	/**
	 * Placeholder slot — kept for parity with React's state shape so
	 * consumers can style swipe states via `data-swiping` even though the
	 * tier-3b Solid port doesn't emit it from internal gesture tracking.
	 */
	swiping: boolean;
	/** See {@link ToastRootState.swiping}. */
	swipeDirection: "up" | "down" | "left" | "right" | undefined;
}

/**
 * Context consumed by compound parts (Title, Description, Action, Close)
 * to read the current toast + its identifiers. Every reactive slot is an
 * accessor so descendants stay subscribed without a top-level reactive
 * read.
 */
export interface ToastRootContextValue {
	toast: Accessor<ToastObject<object>>;
	titleId: Accessor<string | undefined>;
	setTitleId: (next: string | undefined) => void;
	descriptionId: Accessor<string | undefined>;
	setDescriptionId: (next: string | undefined) => void;
	expanded: Accessor<boolean>;
	/** Visible stack index (`0` = frontmost). `-1` while exiting. */
	visibleIndex: Accessor<number>;
	/** Re-measure the root and update stack `height` in the store. */
	recalculateHeight: () => void;
}

export const ToastRootContext = createContext<
	ToastRootContextValue | undefined
>(undefined);

export function useToastRootContext(): ToastRootContextValue {
	const ctx = useContext(ToastRootContext);
	if (!ctx) {
		throw new Error(
			"Base UI: ToastRootContext is missing. Toast parts must be used within <Toast.Root>.",
		);
	}
	return ctx;
}